نتایج جستجو برای: pyramidal tracts
تعداد نتایج: 27462 فیلتر نتایج به سال:
BACKGROUND Current magnetic resonance imaging (MRI) outcome measures such as T2 lesion load correlate poorly with disability in multiple sclerosis. Diffusion tensor imaging (DTI) of the brain can provide unique information regarding the orientation and integrity of white matter tracts in vivo. OBJECTIVE To use this information to map the pyramidal tracts of patients with multiple sclerosis, i...
In this work, we propose to use fiber tracking in order to analyze and quantify the state of the pyramidal tracts in patients affected by tumors. We introduce a framework that includes an automatic method to obtain the fibers involved in the pyramidal tract of any subject, in order to compare robustly fiber bundles affected by tumors with healthy fiber tracts from control subjects and also to q...
After a long and tortuous history spanning over a century of clinicoanatomical and experimental observations, the concept of spasticity has assumed its current form as a velocity-dependent increase of tone in a group of passively stretched muscles. However, several gaps have remained in the understanding of spasticity as a clinical and experimental phenomenon. A long-standing controversy concer...
PURPOSE To evaluate the feasibility of performing diffusion tensor tractography (DTT) to map and quantify the pyramidal white matter tracts of premature newborns. MATERIALS AND METHODS Fourteen diffusion tensor MRI (DTI) examinations of nine premature newborns were evaluated. DTT was performed to segment bilateral pyramidal tracts, using a fiber-tracking algorithm originating in the cerebral ...
BACKGROUND AND PURPOSE Diffusion tensor imaging (DTI) was introduced as a good technique to evaluate structural abnormalities in the white matter. In this study, we used DTI to examine anisotropic changes of the pyramidal tracts displaced by chronic subdural hematoma (CSDH). MATERIALS AND METHODS Twenty-six patients with unilateral CSDH underwent DTI before and after surgery. We measured frac...
OBJECTIVE To demonstrate the role of diffusion tensor tractography (DTT) in preoperative mapping of eloquent tracts in relation to cerebral tumors and to determine whether it is helpful for neurosurgical planning and postoperative assessment. METHODS AND MATERIALS Sixteen patients with brain tumors underwent diffusion tensor imaging (DTI). The pyramidal tract, corpus callosum and optic radiat...
The neocortex is characterized by lamination of its neuron cell bodies in six layers, but there are few clues as to how this comes about and what is its function. Recent studies provide evidence that evolution from simple three-layer cortex may give insight into this problem. Three-layer cortex arose in the olfactory, hippocampal and dorsal cortex of the early amniote forebrain based on a corti...
NeuroQLab DTI is a software tool which we developed for efficient and robust fiber tractography and fiber quantification. It consists of deterministic and probabilistic fiber tracking algorithms and offers multiple options for seeding and filtering fiber tracts. This paper shows the fiber tracking results for three different patient data sets, published within the context of the 2015 DTI tracto...
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